NextGen Gallery Disappeared

I clicked on the automatic update for the NextGen Gallery and it said that the install failed although I’ve used it before sucessfully. Now the Gallery has disappeared from the admin page and also from the website itself, I just get the [album id=x template=extend] placeholders.

This also happened with Contact Form 7 and I just wondered if there was a way to reactivate them? They don’t appear in the plugin page anymore and if I try and reinstall them it fails saying that the path already exists.

Thanks,

Matt